dns4.servidoresph.com has no MX records.
Question and response
Question
dig dns4.servidoresph.com. MX
Answer
The response has no answer records.
Authority
servidoresph.com. 1800 SOA andy.ns.cloudflare.com. dns.cloudflare.com. 2396934111 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0